固定式测斜仪对洞桩法施工车站边桩深层水平位移的监测

利用固定式测斜仪对洞桩法暗挖施工车站的边桩深层水平位移展开实地监测工作。实际监测数据分析结果表明:测斜仪电缆保护对试验的进行非常重要;温度修正对试验结果的影响不大,应剔除受电磁干扰而异常的测试数据;选定冠梁施工后的电压值作为初始状态;桩体水平位移主要受小导洞内初期支护扣拱回填、初期支护凿除和站厅层土方开挖的影响;扣拱开挖、二次衬砌扣拱期间位移变化不大。

Application of In-place Inclinometer in Deep Stratum Side Pile Horizontal Displacement Monitoring of PBA Metro Station

The in-place inclinometers are applied in the monitoring of deep stratum side pile horizontal displacement for metro station built with pile-beam-arch(PBA)method.The results of monitoring data analysis show that the protection of the inclinometer cable is very important for the experiment.Since the temperature changes have less impact on the test result,the abnormal test data disrupted by electromagnetic interference should be eliminated,the voltage value of crown beam after construction should be selected as the initial state.The horizontal displacement of slide pile is mainly influenced by the back-filling of the arch,the cutting of the sprayed concrete support and the earth excavation inside the small guide hole at the initial stages,therefore the horizontal displacement during the second buckle arch excavation and lining is not obvious.